1123139779 has 2 divisors, whose sum is σ = 1123139780. Its totient is φ = 1123139778.

The previous prime is 1123139741. The next prime is 1123139791. The reversal of 1123139779 is 9779313211.

It is a strong prime.

It is an emirp because it is prime and its reverse (9779313211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1123139779 - 2⁷ = 1123139651 is a prime.

It is a super-2 number, since 2×1123139779² = 2522885926344337682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1123139729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561569889 + 561569890.

It is an arithmetic number, because the mean of its divisors is an integer number (561569890).

Almost surely, 2^1123139779 is an apocalyptic number.

1123139779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123139779 is an equidigital number, since it uses as much as digits as its factorization.

1123139779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 43.

The square root of 1123139779 is about 33513.2776522978. The cubic root of 1123139779 is about 1039.4683485182.

The spelling of 1123139779 in words is "one billion, one hundred twenty-three million, one hundred thirty-nine thousand, seven hundred seventy-nine".